import { inherits as inherits$0 } from "util";
import Hash from "./hash";
/*
 * A JavaScript implementation of the Secure Hash Algorithm, SHA-0, as defined
 * in FIPS PUB 180-1
 * This source code is derived from sha1.js of the same repository.
 * The difference between SHA-0 and SHA-1 is just a bitwise rotate left
 * operation was added.
 */
var inherits = { inherits: inherits$0 }.inherits;
var K = [
    0x5a827999, 0x6ed9eba1, 0x8f1bbcdc | 0, 0xca62c1d6 | 0
];
var W = new Array(80);
function Sha() {
    this.init();
    this._w = W;
    Hash.call(this, 64, 56);
}
inherits(Sha, Hash);
Sha.prototype.init = function () {
    this._a = 0x67452301;
    this._b = 0xefcdab89;
    this._c = 0x98badcfe;
    this._d = 0x10325476;
    this._e = 0xc3d2e1f0;
    return this;
};
function rotl5(num) {
    return (num << 5) | (num >>> 27);
}
function rotl30(num) {
    return (num << 30) | (num >>> 2);
}
function ft(s, b, c, d) {
    if (s === 0)
        return (b & c) | ((~b) & d);
    if (s === 2)
        return (b & c) | (b & d) | (c & d);
    return b ^ c ^ d;
}
Sha.prototype._update = function (M) {
    var W = this._w;
    var a = this._a | 0;
    var b = this._b | 0;
    var c = this._c | 0;
    var d = this._d | 0;
    var e = this._e | 0;
    for (var i = 0; i < 16; ++i)
        W[i] = M.readInt32BE(i * 4);
    for (; i < 80; ++i)
        W[i] = W[i - 3] ^ W[i - 8] ^ W[i - 14] ^ W[i - 16];
    for (var j = 0; j < 80; ++j) {
        var s = ~~(j / 20);
        var t = (rotl5(a) + ft(s, b, c, d) + e + W[j] + K[s]) | 0;
        e = d;
        d = c;
        c = rotl30(b);
        b = a;
        a = t;
    }
    this._a = (a + this._a) | 0;
    this._b = (b + this._b) | 0;
    this._c = (c + this._c) | 0;
    this._d = (d + this._d) | 0;
    this._e = (e + this._e) | 0;
};
Sha.prototype._hash = function () {
    var H = Buffer.allocUnsafe(20);
    H.writeInt32BE(this._a | 0, 0);
    H.writeInt32BE(this._b | 0, 4);
    H.writeInt32BE(this._c | 0, 8);
    H.writeInt32BE(this._d | 0, 12);
    H.writeInt32BE(this._e | 0, 16);
    return H;
};
export default Sha;
